If the tractor has been sitting for any length of time, the gas in the carb has turned to varnish and cause the needle valve to become sticky. Tapping on the carb will loosen it up a bit, but only temporarily. It is also quite possible that the hinge pin for the float has become sticky and the float cannot drop as needed. Probably your best option at this time to get a can of aerosol carb cleaner, take the carb apart and clean the needle valve and seat, as well as the float and the hinge pin. Probably will not need a complete rebuild, but you probably will need a new gasket for in between the top and bottom carb halves.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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